Method for determining a center position of a vehicle steering system
First Claim
1. A method for determining a center position of a vehicle steering system, said method comprising the steps of:
- reading a plurality of predetermined inputs from a group comprising steering sensor counts, vehicle longitudinal velocity, vehicle yaw velocity, brake control, vehicle lateral acceleration and steering wheel angular velocity;
reading a count of the steering sensor counts;
determining whether the read count is less than a minimum count, setting the minimum count to the read count if the read count is less than the minimum count, determining whether the read count is greater than a maximum count if the read count is not less than the minimum count, and setting the maximum count equal to the read count if the read count is greater than the maximum count;
setting a minimum center position and maximum center position for the vehicle steering system based on the minimum count and the maximum count;
determining whether predetermined conditions have been met based on the read predetermined inputs;
calculating a center position of the vehicle steering system based on said vehicle longitudinal velocity and said vehicle yaw velocity of the read predetermined inputs if the predetermined conditions have been met;
determining whether the calculated center position is within the minimum center position and the maximum center position; and
concluding that the calculated center position is the center position of the vehicle steering system if the calculated center position is within the minimum center position and the maximum center position.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for determining a center position of a vehicle steering system, said method comprising the steps of reading a plurality of predetermined inputs. The method includes the steps of roughly estimating a center position of the vehicle steering system after the vehicle begins moving based upon the read predetermined inputs and determining whether the steering wheel of the vehicle steering system is approximately straight. The method further includes the steps of accurately estimating a center position of the vehicle steering system if the steering wheel of the vehicle steering system is approximately straight and concluding that the accurately estimated center position is the center position of the vehicle steering system if the steering wheel of the vehicle steering system is approximately straight and Concluding that the roughly estimated center position is the center position of the vehicle steering system if the steering wheel of the vehicle steering system is not approximately straight.
30 Citations
17 Claims
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1. A method for determining a center position of a vehicle steering system, said method comprising the steps of:
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reading a plurality of predetermined inputs from a group comprising steering sensor counts, vehicle longitudinal velocity, vehicle yaw velocity, brake control, vehicle lateral acceleration and steering wheel angular velocity; reading a count of the steering sensor counts; determining whether the read count is less than a minimum count, setting the minimum count to the read count if the read count is less than the minimum count, determining whether the read count is greater than a maximum count if the read count is not less than the minimum count, and setting the maximum count equal to the read count if the read count is greater than the maximum count; setting a minimum center position and maximum center position for the vehicle steering system based on the minimum count and the maximum count; determining whether predetermined conditions have been met based on the read predetermined inputs; calculating a center position of the vehicle steering system based on said vehicle longitudinal velocity and said vehicle yaw velocity of the read predetermined inputs if the predetermined conditions have been met; determining whether the calculated center position is within the minimum center position and the maximum center position; and concluding that the calculated center position is the center position of the vehicle steering system if the calculated center position is within the minimum center position and the maximum center position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining a center position of a vehicle steering system, said method comprising the steps of:
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reading a plurality of predetermined inputs from a group comprising steering sensor counts, vehicle longitudinal velocity vehicle yaw velocity, brake control, vehicle lateral acceleration and steering wheel angular velocity and calculating an estimated center position of the vehicle steering system based on said vehicle longitudinal velocity and said vehicle yaw velocity; determining whether the read count is less than a minimum count, setting the minimum count to the read count if the read count is less than the minimum count, determining whether the read count is greater than a maximum count if the read count is not less than the minimum count, and setting the maximum count equal to the read count if the read count is greater than the maximum count; setting a minimum center position and maximum center position for the vehicle steering system based on the minimum count and the maximum count; determining whether predetermined conditions have been met based on the read predetermined inputs; calculating a center position of the vehicle steering system based on said estimated center position if the predetermined conditions have been met; determining whether the calculated center position is greater than the maximum center position, setting the calculated center position equal to the maximum center position if the calculated center position is greater than the maximum center position, determining whether the calculated center position is less than the minimum center position if the center position is not greater than the maximum center position, and setting the calculated center position equal to the minimum center position if the calculated center position is less than the minimum center position; concluding that the calculated center position is the center position of the vehicle steering system if the calculated center position is within the minimum center position and the maximum center position. - View Dependent Claims (13, 14, 15, 16)
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17. A method for determining a center position of a vehicle steering system, said method comprising the steps of:
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reading a plurality of predetermined inputs from a group comprising steering sensor counts, vehicle longitudinal velocity, vehicle yaw velocity, brake control, vehicle lateral acceleration and steering wheel angular velocity; reading a count of the steering sensor counts; determining whether the read count is less than the minimum count, setting the minimum count to the read count if the read count is less than the minimum count, determining whether the read count is greater than the maximum count if the read count is not less than the minimum count, and setting the maximum count equal to the read count if the read count is greater than the maximum count; setting a minimum center position and a maximum center position for the vehicle steering system based on the minimum count and the maximum count; roughly estimating a center position of the vehicle steering system based on said vehicle longitudinal velocity and said vehicle yaw velocity of the read predetermined inputs after the vehicle begins moving; determining whether the steering wheel of the vehicle steering system is approximately straight; finely estimating a center position of the vehicle steering system if the steering wheel of the vehicle steering system is approximately straight; and concluding that the finely estimated center position is the center position of the vehicle steering system if the steering wheel of the vehicle steering system is approximately straight and the finely estimated center position is within the minimum center position and the maximum center position; and concluding that the roughly estimated center position is the center position of the vehicle steering system if the steering wheel of the vehicle steering system is not approximately straight and the roughly estimated center position is within the minimum center position and the maximum center position.
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Specification